One-way safety pressure relief assembly for pump

Abstract

The utility model discloses a one-way safety pressure relief assembly for a pump, which belongs to the technical field of machine belt pumps and is characterized in that a mounting hole is arranged on a pump rear cover positioned in a high-pressure cavity in a pump body, a valve seat is arranged in the mounting hole, and a pressure relief channel for communicating the high-pressure cavity in the pump body with the outside is arranged in the valve seat; a valve element is arranged in the pressure relief channel close to the outer side of the pump rear cover, and the valve element and the valve seat are matched to form a sealing pair. A core shaft is arranged in the valve element in the axial direction of the valve seat in a penetrating mode, the end, away from the valve element, of the core shaft penetrates through the valve seat and extends into a high-pressure cavity of the pump body, an installation seat is arranged at the end, away from the valve element, of the core shaft, and the part, located in the high-pressure cavity in the pump body, of the core shaft is sleeved with a spring providing closing force for the valve element. The two ends of the spring abut against the valve seat and the installation seat respectively. According to the three-screw pump, high-pressure media in the pump body can be discharged out of the pump body from the high-pressure cavity, pressure relief of the high-pressure cavity is achieved, the stability and safety of the three-screw pump are improved, and the service life of the three-screw pump is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine-driven pumps, and in particular relates to a one-way safety pressure relief component for a pump. Background Art

[0002] At present, foreign gear pumps are widely used in diesel engines. According to localization needs and usage conditions, three-screw pumps can replace the original gear pumps, and China has mature three-screw pump manufacturing experience. However, due to the compact internal structure of diesel engines, this places great demands on the safety of three-screw pumps.

[0003] A pressure relief component is provided on the screw pump to protect the equipment. The pressure relief component is in a normally closed state when the opening and closing parts are subjected to external forces. When the medium pressure in the equipment rises to exceed the specified value, the medium pressure in the equipment is prevented from exceeding the specified value by discharging the medium to the outside of the system.

[0004] However, the existing pressure relief assembly has a complex assembly structure and requires regular replacement and maintenance. During the maintenance process, the pump rear cover needs to be disassembled to repair the assembly, which cannot meet the working requirements of the machine-driven pump. Summary of the invention

[0005] In view of the problems existing in the prior art, the utility model provides a one-way safety pressure relief component for a pump, which can discharge the high-pressure medium in the pump body from the high-pressure chamber to the outside of the pump body, thereby achieving pressure relief of the high-pressure chamber, improving the stability and safety of the three-screw pump and extending its service life.

[0006] The utility model is implemented as follows: a one-way safety pressure relief assembly for a pump, a mounting hole is provided on a pump rear cover located in a high-pressure chamber of a pump body, a valve seat is provided in the mounting hole, a pressure relief channel for connecting the high-pressure chamber of the pump body with the outside is provided in the valve seat, a valve core is provided in the pressure relief channel near the outside of the pump rear cover, and the valve core cooperates with the valve seat to form a sealing pair;

[0007] A core shaft is arranged in the valve core along the axial direction of the valve seat, and the end of the core shaft away from the valve core passes through the valve seat and extends into the high-pressure chamber of the pump body. A mounting seat is arranged at the end of the core shaft away from the valve core, and a spring providing closing force for the valve core is sleeved on the core shaft located in the high-pressure chamber of the pump body, and two ends of the spring are respectively abutted against the valve seat and the mounting seat.

[0008] Furthermore, the core shaft near the valve core side is the operating end, and the core shaft away from the valve core side is the adjusting end. The mounting seat is sleeved on the adjusting end, and a threaded section is provided on the core shaft at the adjusting end, and a nut abutting against the mounting seat is provided on the threaded section. The core shaft is rotated by the nut abutting against the mounting seat, and the nut moves along the core shaft on the threaded section, thereby driving the mounting seat to move along the core shaft to squeeze the spring, adjust the preload force of the spring, and then adjust the pressure relief opening pressure set according to different working conditions, without disassembling the three-screw pump due to changing system parameters.

[0009] Further, the valve seat includes a connecting portion arranged in the mounting hole and a mounting portion arranged in the high-pressure chamber, a pressure relief chamber opening toward the outside of the pump body is arranged in the connecting portion, and a flow hole for connecting the high-pressure chamber with the pressure relief chamber is arranged on the connecting portion close to the high-pressure chamber side, and the flow hole and the pressure relief chamber form the pressure relief channel;

[0010] A step surface is formed at the connection position between the mounting portion and the connecting portion, and a spring sleeve away from the mounting seat side is arranged on the mounting portion and abuts against the step surface.

[0011] Furthermore, the adjusting end is provided with a cylindrical pin for limiting the position of the nut. The cylindrical pin can limit the position of the nut to prevent the nut from falling off during long-term operation in an environment with large vibration and noise.

[0012] Furthermore, the flow holes are provided in plurality, and the plurality of flow holes are evenly distributed on the side wall of the connecting portion along the circumference of the valve seat. The plurality of flow holes provided can ensure the communication between the high pressure chamber and the pressure relief chamber, thereby ensuring the unobstructed pressure relief channel and maintaining sufficient flow rate.

[0013] Furthermore, the valve seat and the pump rear cover are connected by threads, which facilitates the disassembly and assembly of the pressure relief assembly and ensures the reliability of the connection.

[0014] Furthermore, an anti-loosening gasket is arranged between the valve seat and the pump rear cover, which can ensure that the assembly can maintain safe and stable operation in an environment with large vibration and noise of the diesel engine, so that the valve seat and the pump rear cover are reliably connected to avoid loosening of the valve seat and the pump rear cover.

[0015] Furthermore, a sealing gasket is provided between the pump rear cover and the pump body to ensure the sealing between the pump rear cover and the pump body and avoid leakage at the high pressure chamber.

[0016] Furthermore, the horizontal center lines of the valve seat, valve core and core shaft are located on the same axis.

[0017] The utility model has the following advantages and technical effects: Due to the adoption of the above technical solution, the high-pressure medium in the pump body can be discharged from the high-pressure cavity to the outside of the pump body, thereby achieving pressure relief in the high-pressure cavity, improving the stability and safety of the three-screw pump, and extending its service life. The structure is convenient for disassembly and assembly, and is not subject to assembly restrictions. During maintenance, the rear cover of the pump does not need to be removed, which is convenient for use and operation; there is no need to design a separate cavity in the pump body, which reduces the volume of the pump body and is suitable for use in working conditions with limited space, meeting the working requirements of the machine-driven pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the installation structure provided by the utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure provided by the utility model.

[0020] In the figure: 1. Pump body; 2. Pump back cover; 3. Valve seat; 3-1. Connecting part; 3-2. Mounting part; 3-3. Pressure relief chamber; 3-4. Flow hole; 4. Valve core; 5. Core shaft; 5-1. Operating end; 5-2. Adjusting end; 6. Mounting seat; 7. Spring; 8. Nut; 9. Cylindrical pin; 10. Anti-loosening gasket; 11. Sealing gasket. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0022] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] like Figure 1 and Figure 2 As shown, the present application provides a one-way safety pressure relief assembly for a pump, wherein a mounting hole is provided on a pump rear cover 2 located in a high-pressure chamber in a pump body 1, a valve seat 3 is provided in the mounting hole, a pressure relief channel for connecting the high-pressure chamber in the pump body 1 with the outside is provided in the valve seat 3, a valve core 4 is provided in the pressure relief channel near the outside of the pump rear cover 2, and the valve core 4 cooperates with the valve seat 3 to form a sealing pair;

[0024] A core shaft 5 is provided in the valve core 4 along the axial direction of the valve seat 3, and the end of the core shaft 5 away from the valve core 4 passes through the valve seat 3 and extends into the high-pressure chamber of the pump body 1. A mounting seat 6 is provided at the end of the core shaft 5 away from the valve core 4, and a spring 7 for providing closing force for the valve core 4 is sleeved on the core shaft 5 located in the high-pressure chamber of the pump body 1, and the two ends of the spring 7 are respectively abutted against the valve seat 3 and the mounting seat 6.

[0025] Furthermore, the valve seat 3 and the pump rear cover 2 are connected by threads, which facilitates the disassembly and assembly of the pressure relief assembly and ensures the reliability of the connection.

[0026] Furthermore, an anti-loosening gasket 10 is arranged between the valve seat 3 and the pump rear cover 2. This can ensure that the assembly can maintain safe and stable operation in an environment with large vibration and noise of the diesel engine, so that the valve seat 3 and the pump rear cover 2 are reliably connected to prevent the valve seat 3 and the pump rear cover 2 from loosening.

[0027] Furthermore, a sealing gasket 11 is provided between the pump rear cover 2 and the pump body 1 to ensure the sealing between the pump rear cover 2 and the pump body 1 and avoid leakage at the high pressure chamber.

[0028] Furthermore, the horizontal center lines of the valve seat 3, the valve core 4 and the core shaft 5 are located on the same axis.

[0029] In a preferred example of the present application, the core shaft 5 close to the valve core 4 is the operating end 5-1, the core shaft 5 away from the valve core 4 is the adjusting end 5-2, the mounting seat 6 is sleeved on the adjusting end 5-2, and the core shaft 5 located at the adjusting end 5-2 is provided with a threaded section, and the threaded section is provided with a nut 8 abutting against the mounting seat 6. By having the nut 8 abutting against the mounting seat 6, the core shaft 5 is rotated by rotating the operating end 5-1, so that the nut 8 moves along the core shaft 5 on the threaded section, thereby driving the mounting seat 6 to move along the core shaft 5 to squeeze the spring 7, adjust the preload force of the spring 7 and then adjust the pressure relief opening pressure set according to different working conditions, without disassembling the three-screw pump due to changing system parameters.

[0030] Further, the adjusting end 5-2 is provided with a cylindrical pin 9 for limiting the position of the nut 8. The cylindrical pin 9 provided can limit the position of the nut 8 to prevent the nut 8 from falling off during long-term operation in an environment with large vibration and noise.

[0031] In another preferred embodiment of the present application, the valve seat 3 includes a connecting portion 3-1 arranged in the mounting hole and a mounting portion 3-2 arranged in the high-pressure chamber, a pressure relief chamber 3-3 opening toward the outside of the pump body 1 is arranged in the connecting portion 3-1, and a flow hole 3-4 for connecting the high-pressure chamber with the pressure relief chamber 3-3 is arranged on the connecting portion 3-1 close to the high-pressure chamber side, and the flow hole 3-4 and the pressure relief chamber 3-3 form the pressure relief channel;

[0032] The connection position between the mounting portion 3 - 2 and the connecting portion 3 - 1 forms a stepped surface, and the spring 7 away from the mounting seat 6 is sleeved on the mounting portion 3 - 2 and abuts against the stepped surface.

[0033] Furthermore, the flow holes 3-4 are provided in plurality, and the plurality of flow holes 3-4 are evenly distributed on the side wall of the connecting portion 3-1 along the circumference of the valve seat 3. The plurality of flow holes 3-4 provided can ensure the communication between the high pressure chamber and the pressure relief chamber 3-3, thereby ensuring the unobstructed pressure relief channel and maintaining a sufficient flow rate.

[0034] The structural design of the valve seat 3 realizes multiple functions of one component, namely: ensuring the seal with the valve core 4; with the pump back cover 2; maintaining sufficient flow rate; and providing installation positioning for the spring 7.

[0035] By adopting the above technical solution, the high-pressure medium in the pump body 1 can be discharged from the high-pressure cavity to the outside of the pump body 1, thereby achieving pressure relief of the high-pressure cavity, improving the stability and safety of the three-screw pump, and extending its service life. The structure is convenient for disassembly and assembly, and is not subject to assembly restrictions. During maintenance, the pump rear cover 2 does not need to be disassembled, which is convenient for use and operation; there is no need to design a separate cavity in the pump body 1, which reduces the volume of the pump body 1, and is suitable for use under conditions with limited space, meeting the working requirements of the machine-driven pump.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A one-way safety pressure relief assembly for a pump, characterized in that: A mounting hole is provided on the pump rear cover located in the high-pressure chamber of the pump body, a valve seat is provided in the mounting hole, a pressure relief passage for connecting the high-pressure chamber in the pump body with the outside is provided in the valve seat, a valve core is provided in the pressure relief passage close to the outside of the pump rear cover, and the valve core cooperates with the valve seat to form a sealing pair; A core shaft is arranged in the valve core along the axial direction of the valve seat, and the end of the core shaft away from the valve core passes through the valve seat and extends into the high-pressure chamber of the pump body. A mounting seat is arranged at the end of the core shaft away from the valve core, and a spring providing closing force for the valve core is sleeved on the core shaft located in the high-pressure chamber of the pump body, and two ends of the spring are respectively abutted against the valve seat and the mounting seat.

2. The one-way safety pressure relief assembly for a pump according to claim 1, characterized in that: The core shaft close to the valve core side is the operating end, and the core shaft away from the valve core side is the adjusting end. The mounting seat is sleeved on the adjusting end. A threaded section is provided on the core shaft at the adjusting end, and a nut abutting against the mounting seat is provided on the threaded section.

3. The one-way safety pressure relief assembly for a pump according to claim 1 or 2, characterized in that: The valve seat comprises a connecting portion arranged in the mounting hole and a mounting portion arranged in the high-pressure chamber, a pressure relief chamber opening toward the outside of the pump body is arranged in the connecting portion, a flow hole for connecting the high-pressure chamber with the pressure relief chamber is arranged on the connecting portion close to the high-pressure chamber side, and the flow hole and the pressure relief chamber form the pressure relief channel; A step surface is formed at the connection position between the mounting portion and the connecting portion, and a spring sleeve away from the mounting seat side is arranged on the mounting portion and abuts against the step surface.

4. The one-way safety pressure relief assembly for a pump according to claim 2, characterized in that: The adjusting end is provided with a cylindrical pin for limiting the position of the nut.

5. The one-way safety pressure relief assembly for a pump according to claim 3, characterized in that: A plurality of the flow holes are provided, and the plurality of flow holes are evenly distributed on the side wall of the connecting portion along the circumference of the valve seat.

6. The one-way safety pressure relief assembly for a pump according to claim 1, characterized in that: The valve seat and the pump rear cover are connected by threads.

7. The one-way safety pressure relief assembly for a pump according to claim 1, characterized in that: An anti-loosening gasket is arranged between the valve seat and the pump rear cover.

8. The one-way safety pressure relief assembly for a pump according to claim 1, characterized in that: A sealing gasket is arranged between the pump rear cover and the pump body.

9. The one-way safety pressure relief assembly for a pump according to claim 1, characterized in that: The horizontal center lines of the valve seat, valve core and core shaft are located on the same axis.

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